JavaScript-Developer-I基礎問題集、JavaScript-Developer-I資格準備

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Salesforce JavaScript-Developer-I Exam Syllabus Topics:

Section	Weight	Objectives
Topic 1: Debugging and Error Handling	7%	- Breakpoints and code inspection - Custom error types - Error handling techniques (try/catch/finally) - Console methods for debugging
Topic 2: Objects, Functions, and Classes	25%	- Prototypal inheritance - Variable scope and closures - Modules and decorators - Higher-order functions - Arrow functions - Object creation and manipulation - ES6 classes and inheritance - Execution flow and context - Function declarations and expressions
Topic 3: Testing	7%	- Test coverage and reliability - Writing and modifying unit tests - Test effectiveness evaluation - Unit testing concepts
Topic 4: Variables, Types, and Collections	23%	- Primitive and complex data types - Truthy and falsy evaluations - Strings, numbers, and dates - JSON parsing and manipulation - Arrays and collections - Type coercion and conversion - Variable declarations and initialization
Topic 5: Browser and Events	17%	- Event handling and listeners - Event propagation (bubbling and capturing) - Interacting with forms and user input - Browser Developer Tools usage - DOM manipulation - Browser-specific APIs
Topic 6: Asynchronous Programming	13%	- Callbacks - Promises (creation, chaining, error handling) - Async/Await syntax - Asynchronous patterns for business requirements - Event loop and execution flow
Topic 7: Server Side JavaScript	8%	- Server-side JavaScript implementations - Node.js fundamentals - Core Node.js modules - CLI commands - Package management (npm)

>> JavaScript-Developer-I基礎問題集 <<

JavaScript-Developer-I資格準備、JavaScript-Developer-I試験概要

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Salesforce Certified JavaScript Developer (JS-Dev-101) 認定 JavaScript-Developer-I 試験問題 (Q132-Q137):

質問 # 132
At Universal Containers, every team has its own way of copying JavaScript objects. The code snippet shows an Implementation from one team:

What is the output of the code execution?

A. Hello John Doe
B. Hello Dan
C. Hello Dan Doe
D. SyntaxError: Unexpected token in JSON

正解：D

質問 # 133
Refer to the following code:

What is the output of line 11?

A. [''foo:1'', ''bar:2'']
B. [1, 2]
C. ['foo'', ''bar'']
D. [''bar'' , ''foo'']

正解：C

質問 # 134
Code:
01 const sayHello = (name) = > {
02 console.log( ' Hello ' , name);
03 };
04
05 const world = () = > {
06 return ' World ' ;
07 };
08
09 sayHello(world);
This does not print " Hello World " .
What change is needed?

A. Change line 9 to sayHello(world)();
B. Change line 2 to console.log( ' Hello ' , name());
C. Change line 7 to }();
D. Change line 5 to function world() {

正解：B

解説：
Currently:
* sayHello expects a value name and prints it.
* world is a function that returns ' World ' .
* sayHello(world); passes the function object itself, not the result of calling it.
So name inside sayHello is a function, not the string " World " .
To keep the call sayHello(world) yet get " World " , sayHello must call the function parameter:
const sayHello = (name) = > {
console.log( ' Hello ' , name());
};
Now:
* sayHello(world) passes the function.
* Inside sayHello, name() calls world(), which returns " World " .
* The console logs " Hello World " .
Why the others are wrong:
* B: Changing line 7 to }(); would attempt to IIFE the function definition and break the declaration.
* C: sayHello(world)() would try to call the return value of sayHello, which is undefined, causing an error.
* D: Changing world to a function declaration does not change the fact that it is passed as a function reference; sayHello still prints the function object, not ' World ' .

質問 # 135
developer is trying to convince management that their team will benefit from using
Node.js for a backend server that they are going to create. The server will be a web server that
handles API requests from a website that the team has already built using HTML, CSS, and
JavaScript.
Which three benefits of Node.js can the developer use to persuade their manager?
Choose 3 answers:

A. Executes server-side JavaScript code to avoid learning a new language.
B. I nstalls with its own package manager to install and manage third-party libraries.
C. Ensures stability with one major release every few years.
D. User non blocking functionality for performant request handling .
E. Performs a static analysis on code before execution to look for runtime errors.

正解：B、D、E

質問 # 136
Refer to the code below:
new Promise((resolve, reject) => {
const fraction = Math.random();
if( fraction >0.5) reject("fraction > 0.5, " + fraction);
resolve(fraction);
})
.then(() =>console.log("resolved"))
.catch((error) => console.error(error))
.finally(() => console.log(" when am I called?"));

When does Promise.finally on line 08 get called?

A. When resolved and settled
B. When resolved or rejected
C. When rejected
D. When resolved

正解：B

質問 # 137
......

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無料でクラウドストレージから最新のJpexam JavaScript-Developer-I PDFダンプをダウンロードする：https://drive.google.com/open?id=1_UKtRVUq2GRy1ImooojV-QRdp8aGSBhm